Two days ago i upgraded one of my Windows XP running desktop to Windows Vista Home Premium. Installation went fine without any problem. The system has just one User Account and that is Admin account. I am the only Administrator of this PC. Now the problem is whenever i try to install any thing on this computer, it ends up with the following error message:
"The system administrator has set policies to prevent this installation".
I tried installing several programs such as iTunes 7.1, Windows Mobile Device Center 6, and many others, but use to get the same error message at last. Any suggestions?